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class="sidebar-heading"><span>实战案例</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/ActualCombat/default.html" class="sidebar-link">关于我</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>面试</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/interview/default.html" class="sidebar-link">关于我</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>系统架构</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/framework/default.html" class="sidebar-link">关于我</a></li></ul></section></li></ul> </aside> <div><main class="page"> <div class="theme-default-content content__default"><h1 id="【高并发】通过源码深度分析线程池中worker线程的执行流程"><a href="#【高并发】通过源码深度分析线程池中worker线程的执行流程" class="header-anchor">#</a> 【高并发】通过源码深度分析线程池中Worker线程的执行流程</h1> <p>在《<a href="/md/concurrent/source/2020-03-30-010-通过ThreadPoolExecutor类的源码深度解析线程池执行任务的核心流程.html">高并发之——通过ThreadPoolExecutor类的源码深度解析线程池执行任务的核心流程</a>》一文中我们深度分析了线程池执行任务的核心流程，在ThreadPoolExecutor类的addWorker(Runnable, boolean)方法中，使用CAS安全的更新线程的数量之后，接下来就是创建新的Worker线程执行任务，所以，我们先来分析下Worker类的源码。</p> <h3 id="worker类分析"><a href="#worker类分析" class="header-anchor">#</a> Worker类分析</h3> <p>Worker类从类的结构上来看，继承了AQS（AbstractQueuedSynchronizer类）并实现了Runnable接口。本质上，Worker类既是一个同步组件，也是一个执行任务的线程。接下来，我们看下Worker类的源码，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token keyword">class</span> <span class="token class-name">Worker</span> <span class="token keyword">extends</span> <span class="token class-name">AbstractQueuedSynchronizer</span> <span class="token keyword">implements</span> <span class="token class-name">Runnable</span> <span class="token punctuation">{</span>
	<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">long</span> serialVersionUID <span class="token operator">=</span> <span class="token number">6138294804551838833L</span><span class="token punctuation">;</span>
	<span class="token comment">//执行任务的线程类</span>
	<span class="token keyword">final</span> <span class="token class-name">Thread</span> thread<span class="token punctuation">;</span>
	<span class="token comment">//初始化执行的任务，第一次执行的任务</span>
	<span class="token class-name">Runnable</span> firstTask<span class="token punctuation">;</span>
	<span class="token comment">//完成任务的计数</span>
	<span class="token keyword">volatile</span> <span class="token keyword">long</span> completedTasks<span class="token punctuation">;</span>
	<span class="token comment">//Worker类的构造方法，初始化任务并调用线程工厂创建执行任务的线程</span>
	<span class="token class-name">Worker</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> firstTask<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token function">setState</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 
		<span class="token keyword">this</span><span class="token punctuation">.</span>firstTask <span class="token operator">=</span> firstTask<span class="token punctuation">;</span>
		<span class="token keyword">this</span><span class="token punctuation">.</span>thread <span class="token operator">=</span> <span class="token function">getThreadFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">newThread</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token comment">//重写Runnable接口的run()方法</span>
	<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">//调用ThreadPoolExecutor类的runWorker(Worker)方法</span>
		<span class="token function">runWorker</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>

	<span class="token comment">//检测是否是否获取到锁</span>
	<span class="token comment">//state=0表示未获取到锁</span>
	<span class="token comment">//state=1表示已获取到锁</span>
	<span class="token keyword">protected</span> <span class="token keyword">boolean</span> <span class="token function">isHeldExclusively</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">return</span> <span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	
	<span class="token comment">//使用AQS设置线程状态</span>
	<span class="token keyword">protected</span> <span class="token keyword">boolean</span> <span class="token function">tryAcquire</span><span class="token punctuation">(</span><span class="token keyword">int</span> unused<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">compareAndSetState</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token function">setExclusiveOwnerThread</span><span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
		<span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>

	<span class="token comment">//尝试释放锁</span>
	<span class="token keyword">protected</span> <span class="token keyword">boolean</span> <span class="token function">tryRelease</span><span class="token punctuation">(</span><span class="token keyword">int</span> unused<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token function">setExclusiveOwnerThread</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token function">setState</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>

	<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span>        <span class="token punctuation">{</span> <span class="token function">acquire</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span>
	<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">tryLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span>  <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token function">tryAcquire</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span>
	<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span>      <span class="token punctuation">{</span> <span class="token function">release</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span>
	<span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">isLocked</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token function">isHeldExclusively</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span>

	<span class="token keyword">void</span> <span class="token function">interruptIfStarted</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token class-name">Thread</span> t<span class="token punctuation">;</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&gt;=</span> <span class="token number">0</span> <span class="token operator">&amp;&amp;</span> <span class="token punctuation">(</span>t <span class="token operator">=</span> thread<span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span>t<span class="token punctuation">.</span><span class="token function">isInterrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token keyword">try</span> <span class="token punctuation">{</span>
				t<span class="token punctuation">.</span><span class="token function">interrupt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">SecurityException</span> ignore<span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br></div></div><p>在Worker类的构造方法中，可以看出，首先将同步状态state设置为-1，设置为-1是为了防止runWorker方法运行之前被中断。这是因为如果其他线程调用线程池的shutdownNow()方法时，如果Worker类中的state状态的值大于0，则会中断线程，如果state状态的值为-1，则不会中断线程。</p> <p>Worker类实现了Runnable接口，需要重写run方法，而Worker的run方法本质上调用的是ThreadPoolExecutor类的runWorker方法，在runWorker方法中，会首先调用unlock方法，该方法会将state置为0，所以这个时候调用shutDownNow方法就会中断当前线程，而这个时候已经进入了runWork方法，就不会在还没有执行runWorker方法的时候就中断线程。</p> <p><strong>注意：大家需要重点理解<strong><strong>Worker</strong></strong>类的实现。</strong></p> <p>Worker类中调用了ThreadPoolExecutor类的runWorker(Worker)方法。接下来，我们一起看下ThreadPoolExecutor类的runWorker(Worker)方法的实现。</p> <h3 id="runworker-worker-方法"><a href="#runworker-worker-方法" class="header-anchor">#</a> runWorker(Worker)方法</h3> <p>首先，我们看下RunWorker(Worker)方法的源码，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">final</span> <span class="token keyword">void</span> <span class="token function">runWorker</span><span class="token punctuation">(</span><span class="token class-name">Worker</span> w<span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token class-name">Thread</span> wt <span class="token operator">=</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">Runnable</span> task <span class="token operator">=</span> w<span class="token punctuation">.</span>firstTask<span class="token punctuation">;</span>
	w<span class="token punctuation">.</span>firstTask <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
	<span class="token comment">//释放锁，将state设置为0,允许中断任务的执行</span>
	w<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">boolean</span> completedAbruptly <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
	<span class="token keyword">try</span> <span class="token punctuation">{</span>
		<span class="token comment">//如果任务不为空，或者从任务队列中获取的任务不为空，则执行while循环</span>
		<span class="token keyword">while</span> <span class="token punctuation">(</span>task <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">||</span> <span class="token punctuation">(</span>task <span class="token operator">=</span> <span class="token function">getTask</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token comment">//如果任务不为空，则获取Worker工作线程的独占锁</span>
			w<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token comment">//如果线程已经停止，或者中断线程后线程终止并且没有成功中断线程</span>
			<span class="token comment">//大家好好理解下这个逻辑</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token function">runStateAtLeast</span><span class="token punctuation">(</span>ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> STOP<span class="token punctuation">)</span> <span class="token operator">||</span>
				 <span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">interrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span>
				  <span class="token function">runStateAtLeast</span><span class="token punctuation">(</span>ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> STOP<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span>
				<span class="token operator">!</span>wt<span class="token punctuation">.</span><span class="token function">isInterrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
				<span class="token comment">//中断线程</span>
				wt<span class="token punctuation">.</span><span class="token function">interrupt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">try</span> <span class="token punctuation">{</span>
				<span class="token comment">//执行任务前执行的逻辑</span>
				<span class="token function">beforeExecute</span><span class="token punctuation">(</span>wt<span class="token punctuation">,</span> task<span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token class-name">Throwable</span> thrown <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
				<span class="token keyword">try</span> <span class="token punctuation">{</span>
					<span class="token comment">//调用Runable接口的run方法执行任务</span>
					task<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">RuntimeException</span> x<span class="token punctuation">)</span> <span class="token punctuation">{</span>
					thrown <span class="token operator">=</span> x<span class="token punctuation">;</span> <span class="token keyword">throw</span> x<span class="token punctuation">;</span>
				<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Error</span> x<span class="token punctuation">)</span> <span class="token punctuation">{</span>
					thrown <span class="token operator">=</span> x<span class="token punctuation">;</span> <span class="token keyword">throw</span> x<span class="token punctuation">;</span>
				<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Throwable</span> x<span class="token punctuation">)</span> <span class="token punctuation">{</span>
					thrown <span class="token operator">=</span> x<span class="token punctuation">;</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">Error</span><span class="token punctuation">(</span>x<span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
					<span class="token comment">//执行任务后执行的逻辑</span>
					<span class="token function">afterExecute</span><span class="token punctuation">(</span>task<span class="token punctuation">,</span> thrown<span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">}</span>
			<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
				<span class="token comment">//任务执行完成后，将其设置为空</span>
				task <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
				<span class="token comment">//完成的任务数量加1</span>
				w<span class="token punctuation">.</span>completedTasks<span class="token operator">++</span><span class="token punctuation">;</span>
				<span class="token comment">//释放工作线程获得的锁</span>
				w<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span>
		completedAbruptly <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
		<span class="token comment">//执行退出Worker线程的逻辑</span>
		<span class="token function">processWorkerExit</span><span class="token punctuation">(</span>w<span class="token punctuation">,</span> completedAbruptly<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br></div></div><p>这里，我们拆解runWorker(Worker)方法。</p> <p>（1）获取当前线程的句柄和工作线程中的任务，并将工作线程中的任务设置为空，执行unlock方法释放锁，将state状态设置为0，此时可以中断工作线程，代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">Thread</span> wt <span class="token operator">=</span> <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">currentThread</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Runnable</span> task <span class="token operator">=</span> w<span class="token punctuation">.</span>firstTask<span class="token punctuation">;</span>
w<span class="token punctuation">.</span>firstTask <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">//释放锁，将state设置为0,允许中断任务的执行</span>
w<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>（2）在while循环中进行判断，如果任务不为空，或者从任务队列中获取的任务不为空，则执行while循环，否则，调用processWorkerExit(Worker, boolean)方法退出Worker工作线程。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">while</span> <span class="token punctuation">(</span>task <span class="token operator">!=</span> <span class="token keyword">null</span> <span class="token operator">||</span> <span class="token punctuation">(</span>task <span class="token operator">=</span> <span class="token function">getTask</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>（3）如果满足while的循环条件，首先获取工作线程内部的独占锁，并执行一系列的逻辑判断来检测是否需要中断当前线程的执行，代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//如果任务不为空，则获取Worker工作线程的独占锁</span>
w<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//如果线程已经停止，或者中断线程后线程终止并且没有成功中断线程</span>
<span class="token comment">//大家好好理解下这个逻辑</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token function">runStateAtLeast</span><span class="token punctuation">(</span>ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> STOP<span class="token punctuation">)</span> <span class="token operator">||</span>
	 <span class="token punctuation">(</span><span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">interrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span>
	  <span class="token function">runStateAtLeast</span><span class="token punctuation">(</span>ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> STOP<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span>
	<span class="token operator">!</span>wt<span class="token punctuation">.</span><span class="token function">isInterrupted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
	<span class="token comment">//中断线程</span>
	wt<span class="token punctuation">.</span><span class="token function">interrupt</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>（4）调用执行任务前执行的逻辑，如下所示</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//执行任务前执行的逻辑</span>
<span class="token function">beforeExecute</span><span class="token punctuation">(</span>wt<span class="token punctuation">,</span> task<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>（5）调用Runable接口的run方法执行任务</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//调用Runable接口的run方法执行任务</span>
task<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>（6）调用执行任务后执行的逻辑</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//执行任务后执行的逻辑</span>
<span class="token function">afterExecute</span><span class="token punctuation">(</span>task<span class="token punctuation">,</span> thrown<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>（7）将完成的任务设置为空，完成的任务数量加1并释放工作线程的锁。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//任务执行完成后，将其设置为空</span>
task <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">//完成的任务数量加1</span>
w<span class="token punctuation">.</span>completedTasks<span class="token operator">++</span><span class="token punctuation">;</span>
<span class="token comment">//释放工作线程获得的锁</span>
w<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>（8）退出Worker线程的执行，如下所示</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//执行退出Worker线程的逻辑</span>
<span class="token function">processWorkerExit</span><span class="token punctuation">(</span>w<span class="token punctuation">,</span> completedAbruptly<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>从代码分析上可以看到，当从Worker线程中获取的任务为空时，会调用getTask()方法从任务队列中获取任务，接下来，我们看下getTask()方法的实现。</p> <h3 id="gettask-方法"><a href="#gettask-方法" class="header-anchor">#</a> getTask()方法</h3> <p>我们先来看下getTask()方法的源代码，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">private</span> <span class="token class-name">Runnable</span> <span class="token function">getTask</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//轮询是否超时的标识</span>
	<span class="token keyword">boolean</span> timedOut <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
	<span class="token comment">//自旋for循环</span>
	<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">//获取ctl</span>
		<span class="token keyword">int</span> c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token comment">//获取线程池的状态</span>
		<span class="token keyword">int</span> rs <span class="token operator">=</span> <span class="token function">runStateOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>

		<span class="token comment">//检测任务队列是否在线程池停止或关闭的时候为空</span>
		<span class="token comment">//也就是说任务队列是否在线程池未正常运行时为空</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>rs <span class="token operator">&gt;=</span> SHUTDOWN <span class="token operator">&amp;&amp;</span> <span class="token punctuation">(</span>rs <span class="token operator">&gt;=</span> STOP <span class="token operator">||</span> workQueue<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token comment">//减少Worker线程的数量</span>
			<span class="token function">decrementWorkerCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
		<span class="token comment">//获取线程池中线程的数量</span>
		<span class="token keyword">int</span> wc <span class="token operator">=</span> <span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>

		<span class="token comment">//检测当前线程池中的线程数量是否大于corePoolSize的值或者是否正在等待执行任务</span>
		<span class="token keyword">boolean</span> timed <span class="token operator">=</span> allowCoreThreadTimeOut <span class="token operator">||</span> wc <span class="token operator">&gt;</span> corePoolSize<span class="token punctuation">;</span>

		<span class="token comment">//如果线程池中的线程数量大于corePoolSize</span>
		<span class="token comment">//获取大于corePoolSize或者是否正在等待执行任务并且轮询超时</span>
		<span class="token comment">//并且当前线程池中的线程数量大于1或者任务队列为空</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>wc <span class="token operator">&gt;</span> maximumPoolSize <span class="token operator">||</span> <span class="token punctuation">(</span>timed <span class="token operator">&amp;&amp;</span> timedOut<span class="token punctuation">)</span><span class="token punctuation">)</span>
			<span class="token operator">&amp;&amp;</span> <span class="token punctuation">(</span>wc <span class="token operator">&gt;</span> <span class="token number">1</span> <span class="token operator">||</span> workQueue<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token comment">//成功减少线程池中的工作线程数量</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">compareAndDecrementWorkerCount</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">)</span>
				<span class="token keyword">return</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
			<span class="token keyword">continue</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>

		<span class="token keyword">try</span> <span class="token punctuation">{</span>
			<span class="token comment">//从任务队列中获取任务</span>
			<span class="token class-name">Runnable</span> r <span class="token operator">=</span> timed <span class="token operator">?</span>
				workQueue<span class="token punctuation">.</span><span class="token function">poll</span><span class="token punctuation">(</span>keepAliveTime<span class="token punctuation">,</span> <span class="token class-name">TimeUnit</span><span class="token punctuation">.</span>NANOSECONDS<span class="token punctuation">)</span> <span class="token operator">:</span>
				workQueue<span class="token punctuation">.</span><span class="token function">take</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token comment">//任务不为空直接返回任务</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span>r <span class="token operator">!=</span> <span class="token keyword">null</span><span class="token punctuation">)</span>
				<span class="token keyword">return</span> r<span class="token punctuation">;</span>
			timedOut <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> retry<span class="token punctuation">)</span> <span class="token punctuation">{</span>
			timedOut <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br></div></div><p>getTask()方法的逻辑比较简单，大家看源码就可以了，我这里就不重复描述了。</p> <p>接下来，我们看下在正式调用Runnable的run()方法前后，执行的beforeExecute方法和afterExecute方法。</p> <h3 id="beforeexecute-thread-runnable-方法"><a href="#beforeexecute-thread-runnable-方法" class="header-anchor">#</a> beforeExecute(Thread, Runnable)方法</h3> <p>beforeExecute(Thread, Runnable)方法的源代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">beforeExecute</span><span class="token punctuation">(</span><span class="token class-name">Thread</span> t<span class="token punctuation">,</span> <span class="token class-name">Runnable</span> r<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>可以看到，beforeExecute(Thread, Runnable)方法的方法体为空，我们可以创建ThreadPoolExecutor的子类来重写beforeExecute(Thread, Runnable)方法，使得线程池正式执行任务之前，执行我们自己定义的业务逻辑。</p> <h3 id="afterexecute-runnable-throwable-方法"><a href="#afterexecute-runnable-throwable-方法" class="header-anchor">#</a> afterExecute(Runnable, Throwable)方法</h3> <p>afterExecute(Runnable, Throwable)方法的源代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">afterExecute</span><span class="token punctuation">(</span><span class="token class-name">Runnable</span> r<span class="token punctuation">,</span> <span class="token class-name">Throwable</span> t<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>可以看到，afterExecute(Runnable, Throwable)方法的方法体同样为空，我们可以创建ThreadPoolExecutor的子类来重写afterExecute(Runnable, Throwable)方法，使得线程池在执行任务之后执行我们自己定义的业务逻辑。</p> <p>接下来，就是退出工作线程的processWorkerExit(Worker, boolean)方法。</p> <h3 id="processworkerexit-worker-boolean-方法"><a href="#processworkerexit-worker-boolean-方法" class="header-anchor">#</a> processWorkerExit(Worker, boolean)方法</h3> <p>processWorkerExit(Worker, boolean)方法的逻辑主要是执行退出Worker线程，并且对一些资源进行清理，源代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">processWorkerExit</span><span class="token punctuation">(</span><span class="token class-name">Worker</span> w<span class="token punctuation">,</span> <span class="token keyword">boolean</span> completedAbruptly<span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//执行过程中出现了异常，突然中断</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span>completedAbruptly<span class="token punctuation">)</span>
		<span class="token comment">//将工作线程的数量减1</span>
		<span class="token function">decrementWorkerCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//获取全局锁</span>
	<span class="token keyword">final</span> <span class="token class-name">ReentrantLock</span> mainLock <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mainLock<span class="token punctuation">;</span>
	mainLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">try</span> <span class="token punctuation">{</span>
		<span class="token comment">//累加完成的任务数量</span>
		completedTaskCount <span class="token operator">+=</span> w<span class="token punctuation">.</span>completedTasks<span class="token punctuation">;</span>
		<span class="token comment">//将完成的任务从workers集合中移除</span>
		workers<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>w<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
		<span class="token comment">//释放锁</span>
		mainLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
	<span class="token comment">//尝试终止工作线程的执行</span>
	<span class="token function">tryTerminate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//获取ctl</span>
	<span class="token keyword">int</span> c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//判断当前线程池的状态是否小于STOP（RUNNING或者SHUTDOWN）</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">runStateLessThan</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span> STOP<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">//如果没有突然中断完成</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>completedAbruptly<span class="token punctuation">)</span> <span class="token punctuation">{</span>
			<span class="token comment">//如果allowCoreThreadTimeOut为true，为min赋值为0，否则赋值为corePoolSize</span>
			<span class="token keyword">int</span> min <span class="token operator">=</span> allowCoreThreadTimeOut <span class="token operator">?</span> <span class="token number">0</span> <span class="token operator">:</span> corePoolSize<span class="token punctuation">;</span>
			<span class="token comment">//如果min为0并且工作队列不为空</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span>min <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span> workQueue<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
				<span class="token comment">//min的值设置为1</span>
				min <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
			<span class="token comment">//如果线程池中的线程数量大于min的值</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">&gt;=</span> min<span class="token punctuation">)</span>
				<span class="token comment">//返回，不再执行程序</span>
				<span class="token keyword">return</span><span class="token punctuation">;</span> 
		<span class="token punctuation">}</span>
		<span class="token comment">//调用addWorker方法</span>
		<span class="token function">addWorker</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br></div></div><p>接下来，我们拆解processWorkerExit(Worker, boolean)方法。</p> <p>（1）执行过程中出现了异常，突然中断执行，则将工作线程数量减1，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//执行过程中出现了异常，突然中断</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>completedAbruptly<span class="token punctuation">)</span>
	<span class="token comment">//将工作线程的数量减1</span>
	<span class="token function">decrementWorkerCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>（2）获取锁累加完成的任务数量，并将完成的任务从workers集合中移除，并释放，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//获取全局锁</span>
<span class="token keyword">final</span> <span class="token class-name">ReentrantLock</span> mainLock <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mainLock<span class="token punctuation">;</span>
mainLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
	<span class="token comment">//累加完成的任务数量</span>
	completedTaskCount <span class="token operator">+=</span> w<span class="token punctuation">.</span>completedTasks<span class="token punctuation">;</span>
	<span class="token comment">//将完成的任务从workers集合中移除</span>
	workers<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span>w<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
	<span class="token comment">//释放锁</span>
	mainLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><p>（3）尝试终止工作线程的执行</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//尝试终止工作线程的执行</span>
<span class="token function">tryTerminate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>（4）处判断当前线程池中的线程个数是否小于核心线程数，如果是，需要新增一个线程保证有足够的线程可以执行任务队列中的任务或者提交的任务。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//获取ctl</span>
<span class="token keyword">int</span> c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//判断当前线程池的状态是否小于STOP（RUNNING或者SHUTDOWN）</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">runStateLessThan</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span> STOP<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//如果没有突然中断完成</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>completedAbruptly<span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">//如果allowCoreThreadTimeOut为true，为min赋值为0，否则赋值为corePoolSize</span>
		<span class="token keyword">int</span> min <span class="token operator">=</span> allowCoreThreadTimeOut <span class="token operator">?</span> <span class="token number">0</span> <span class="token operator">:</span> corePoolSize<span class="token punctuation">;</span>
		<span class="token comment">//如果min为0并且工作队列不为空</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span>min <span class="token operator">==</span> <span class="token number">0</span> <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span> workQueue<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
			<span class="token comment">//min的值设置为1</span>
			min <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
		<span class="token comment">//如果线程池中的线程数量大于min的值</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">&gt;=</span> min<span class="token punctuation">)</span>
			<span class="token comment">//返回，不再执行程序</span>
			<span class="token keyword">return</span><span class="token punctuation">;</span> 
	<span class="token punctuation">}</span>
	<span class="token comment">//调用addWorker方法</span>
	<span class="token function">addWorker</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br></div></div><p>接下来，我们看下tryTerminate()方法。</p> <h3 id="tryterminate-方法"><a href="#tryterminate-方法" class="header-anchor">#</a> tryTerminate()方法</h3> <p>tryTerminate()方法的源代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">final</span> <span class="token keyword">void</span> <span class="token function">tryTerminate</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//自旋for循环</span>
	<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token comment">//获取ctl</span>
		<span class="token keyword">int</span> c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token comment">//如果线程池的状态为RUNNING</span>
		<span class="token comment">//或者状态大于TIDYING</span>
		<span class="token comment">//或者状态为SHUTDOWN并且任务队列为空</span>
		<span class="token comment">//直接返回程序，不再执行后续逻辑</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isRunning</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">||</span>
			<span class="token function">runStateAtLeast</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span> TIDYING<span class="token punctuation">)</span> <span class="token operator">||</span>
			<span class="token punctuation">(</span><span class="token function">runStateOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">==</span> SHUTDOWN <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span> workQueue<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
			<span class="token keyword">return</span><span class="token punctuation">;</span>
		<span class="token comment">//如果当前线程池中的线程数量不等于0</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> 
			<span class="token comment">//中断线程的执行</span>
			<span class="token function">interruptIdleWorkers</span><span class="token punctuation">(</span>ONLY_ONE<span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token keyword">return</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
		<span class="token comment">//获取线程池的全局锁</span>
		<span class="token keyword">final</span> <span class="token class-name">ReentrantLock</span> mainLock <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mainLock<span class="token punctuation">;</span>
		mainLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">try</span> <span class="token punctuation">{</span>
			<span class="token comment">//通过CAS将线程池的状态设置为TIDYING</span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span>ctl<span class="token punctuation">.</span><span class="token function">compareAndSet</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span> <span class="token function">ctlOf</span><span class="token punctuation">(</span>TIDYING<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
				<span class="token keyword">try</span> <span class="token punctuation">{</span>
					<span class="token comment">//调用terminated()方法</span>
					<span class="token function">terminated</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
					<span class="token comment">//将线程池状态设置为TERMINATED</span>
					ctl<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token function">ctlOf</span><span class="token punctuation">(</span>TERMINATED<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
					<span class="token comment">//唤醒所有因为调用线程池的awaitTermination方法而被阻塞的线程</span>
					termination<span class="token punctuation">.</span><span class="token function">signalAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
				<span class="token punctuation">}</span>
				<span class="token keyword">return</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
			<span class="token comment">//释放锁</span>
			mainLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br></div></div><p>（1）获取ctl，根据情况设置线程池状态或者中断线程的执行，并返回。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//获取ctl</span>
<span class="token keyword">int</span> c <span class="token operator">=</span> ctl<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//如果线程池的状态为RUNNING</span>
<span class="token comment">//或者状态大于TIDYING</span>
<span class="token comment">//或者状态为SHUTDOWN并且任务队列为空</span>
<span class="token comment">//直接返回程序，不再执行后续逻辑</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isRunning</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">||</span>
	<span class="token function">runStateAtLeast</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span> TIDYING<span class="token punctuation">)</span> <span class="token operator">||</span>
	<span class="token punctuation">(</span><span class="token function">runStateOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">==</span> SHUTDOWN <span class="token operator">&amp;&amp;</span> <span class="token operator">!</span> workQueue<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
	<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token comment">//如果当前线程池中的线程数量不等于0</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">workerCountOf</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span> <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> 
	<span class="token comment">//中断线程的执行</span>
	<span class="token function">interruptIdleWorkers</span><span class="token punctuation">(</span>ONLY_ONE<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div><p>（2）获取全局锁，通过CAS设置线程池的状态，调用terminated()方法执行逻辑，最终将线程池的状态设置为TERMINATED，唤醒所有因为调用线程池的awaitTermination方法而被阻塞的线程，最终释放锁，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//获取线程池的全局</span>
<span class="token keyword">final</span> <span class="token class-name">ReentrantLock</span> mainLock <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>mainLock<span class="token punctuation">;</span>
mainLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
	<span class="token comment">//通过CAS将线程池的状态设置为TIDYING</span>
	<span class="token keyword">if</span> <span class="token punctuation">(</span>ctl<span class="token punctuation">.</span><span class="token function">compareAndSet</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span> <span class="token function">ctlOf</span><span class="token punctuation">(</span>TIDYING<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
		<span class="token keyword">try</span> <span class="token punctuation">{</span>
			<span class="token comment">//调用terminated()方法</span>
			<span class="token function">terminated</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
			<span class="token comment">//将线程池状态设置为TERMINATED</span>
			ctl<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token function">ctlOf</span><span class="token punctuation">(</span>TERMINATED<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token comment">//唤醒所有因为调用线程池的awaitTermination方法而被阻塞的线程</span>
			termination<span class="token punctuation">.</span><span class="token function">signalAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
		<span class="token keyword">return</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
	<span class="token comment">//释放锁</span>
	mainLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br></div></div><p>接下来，看下terminated()方法。</p> <h3 id="terminated-方法"><a href="#terminated-方法" class="header-anchor">#</a> terminated()方法</h3> <p>terminated()方法的源代码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">terminated</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token punctuation">}</span>
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